you don't need to be upset about every comment.
I would say that you have chosen a very complicated path. Do you expect us to test scripts/plugins developed by someone else, and you will pass on all the proposals to them and wait for them to correct them in the official script?
now you have a script, which has a lot of flaws (and you can correct very few of them yourself), and you're out of favour by the original developer.
Otherwise, I have seen the identical WP plugin installed on many sites (the developer has already sold it many times) and if the shortcomings have not been corrected so far, I am personally very sceptical that anything will change after your reports.